Why You Should Keep A Bike Handy Even If You Don't Cycle Much

"Mrcheerful" wrote
On 30/09/2014 21:20, Bret Cahill wrote:

Stay in lower gears and cycling actually makes knees better.

This corresponds with my experience.

Then why do so many cyclists develop patellofemoral syndrome?

How many is "so many"? Perhaps it actually developed before they became a
"cyclist".